20147842 has 24 divisors (see below), whose sum is σ = 35706960. Its totient is φ = 8452080.

The previous prime is 20147833. The next prime is 20147857. The reversal of 20147842 is 24874102.

It is a self number, because there is not a number n which added to its sum of digits gives 20147842.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1009 + ... + 6427.

It is an arithmetic number, because the mean of its divisors is an integer number (1487790).

Almost surely, 2^20147842 is an apocalyptic number.

20147842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20147842 is a deficient number, since it is larger than the sum of its proper divisors (15559118).

20147842 is a wasteful number, since it uses less digits than its factorization.

20147842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5458 (or 5445 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 20147842 is about 4488.6347590331. The cubic root of 20147842 is about 272.1089618953.

The spelling of 20147842 in words is "twenty million, one hundred forty-seven thousand, eight hundred forty-two".